La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Sea Ice Influences Habitat Type Use by Great Black-backed Gulls (Larus marinus) in Coastal Newfoundland, Canada (2018)
Auteurs :	Laurie D. Maynard, Auteur ; Gail K. Davoren, Auteur
Type de document :	Article
Dans :	Waterbirds (41(4) December, 2018)
Article en page(s) :	449-456
Résumé :	The influence of an unusual concentration of sea ice and breeding failure on the foraging movement patterns and habitat use of Great Black-backed Gulls (Larus marinas) was investigated. GPS loggers were deployed on three incubating females when multi-year sea ice moved into foraging ranges, dividing the tracking period (1-23 June 2017) into ice-free (5-10 days) and ice-present periods (11-12 days). Foraging trip parameters (e.g., distance, duration) differed among individuals but not with ice conditions. Great Black-backed Gulls decreased use of islands when ice was present (0.05 +/- 0.08 locations/trip) relative to absent (5.9 +/- 0.5 locations/trip), but increased use of marine habitat when ice was present (9.4 +/- 0.2 locations/trip) relative to absent (2.9 +/- 0.2 locations/trip). Great Black-backed Gulls also moved at higher speeds in areas of 91-100% ice cover relative to

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